Electric switch



FIP7906 5MM, ,Lb; Q 1,833,476

N'ov. 24, 1931.

T. STRINGERl ELECTRIC SWITCH Filed March 20, 1929 Rl M ww r@ V NS IH M O E Y B (im 7 ATTORNEY Patented Nov. 24, 1931 UNITED STATES PATENT OFFICE THOMAS STRINGER, 0F SAN FRANCISCO, CALIFORNIA, ASSIGNOB 0F ONZE-HALE` T0 i MARK STRINGER, 0F SAN' FRANCISCO, VCALIFORNIA ELECTRIC SWITCH Application led March 20, 1929. Serial No. 348,514.

This invention relates to electric switches, and particularly to the type arranged at a hei ht above the ground and provided with loc ring means which, in addition to assuring contact, may be manually operated in a minimum of time in maximum safety by means of a tool mounted on a pole.

Switches of the kind referred to have obj ectionable features in that they usually comprise a multiplicity of small working parts, detracting from their eiciency, and durability and often necessitating substitution of worn parts at times when operation is most imperative.

The general object of the present invention, therefore is to provide an inexpensive but durable structure designed to give the maximum length of service and to overcome practical disadvantages present in the more or less complex switches now in use.

Other objects and features of the invention will be made evident in the following description and set forth in the appended claims.

In the drawings, in which I show a preferred form of my invention,

Figure 1 is a side elevation:

Figure 2 is a cross-section of the switch embodying my invention, taken on line 2-2 of Figure 1; and

Figure 3 is a side elevation of the contact bar, showing the particular shape thereof as em loyed by me.

witches of this high voltage type are ordinarily mounted overhead to minimize the danger due to the high value of current usually carried, and are operated manually by means of a pole of the required length provided with a hook or angle which en ages or dis-engages the locking means o the switch as desired.

At a given signal the operator may be called upon to disengage or open a number of the switches in a short period of time and therefore a locking means of complex nature would not only be diicult to operate rapidly but would be liable to cause severe damage should any of the working parts fail to operate during an emergency.

My device as illustrated, is applied to a single-pole throw switch, of the usual type, comprising a pair of spaced and relatively insulated contact blocks (not shown) on which a pivoted switch blade and single pair of jaw-clips are mounted with which the blade contacts when the switch is closed.

It is to be appreciated that my invention finds applicability in a number of modifications, which, while not specifically described, are within the scope of my invention as defined by the appended claims.

Referring to Figure 1 of the drawings, the

numeral 1 indicates a switch blade suitably pivoted to the post 2, which is provided with jaws 3 to permit of free movement of the blade. At 4 there is positioned the pair of j aw-clips which engage the blade and I have illustrated them as being cleft for a portion of their height as at 5 to permit that part of the clips not engaged by the locking means to be naturally sprung aording positive reception of the switch blade.

At 6 I provide a bolt as a means of checking the entrance of the switch blade 1 beyond a point necessary for the positive action of my locking means. At 7 in Figure 3 will be noted the extension I provide for the switch blade 1 beyond the jaw-clips 4, showing in detail the peculiar construction of the same. At 8 in Figure 1 is shown my locking means consisting of a stamped envelope piece hinged at 9 and provided with ears 10 which engage both sides of the jaw-clips when the lock is in a closed position, said ears 10 being provided with an arcuate lower edge 16 adapted to engage against the up er sido of ridges 17 formed on the sides of t e jawclips 4, for instance by turning out the lower edges of said clips.

ttention is directed to the shape of the aperture 11 in the locking iece, this aperture is somewhat elongated and divlded by a protuberance 18 formed on the lower edge of the aperture into an upper opening 14 and a lower opening 14a. This locking piece, it will be noted, is apertured at 11 registering substantially with the apertured portion 11a of the extension 7 of the switch blade 1. It will be noted that the locking piece 8 is almost entirely severed with the exception that at 12 I have provided that a small portion of the base of the locking piece be used as a check butting against the notched portion 13 of the extension 7 of switch blade 1.

Vhen operating my switch an angle iron mounted on a pole issimply inserted into the aperture 11 and the locking piece is pushed outwardly and upwardly until the upper edge of the upper opening 14 in the locking piece comes into register with the upper ed e of the opening 11a in the extension 7 o the switch blade 1. This movement causes the ears 10 to disengage the jaw-clips and by simply drawing the angled pole back to the lower opening 14a in the locking piece 8 passi ing over the protuberance 18 and pulling downwardly the switch may be opened.

In closing my switch the operator inserts the angled pole in the upper opening 14 of the extension 7 and pushes the blade until it is inserted in the jaw clips f1, and then draws the hooked pole down until it engages the protuberance 18 of the locking piece 8, which causes the locking piece to turn on the pivot 9 and the ears 10 to engage the ridges on the jaw-clips 4.

I claim:

1. An electric switch adapted to' be actuated by an operating member and comprisin a movable contact making member provide with an aperture, a locking member movably ,mounted on said contact making member, a

member adapted to kbe engaged by said locking member, said lockingwmember being provided with an aperture registering sulciently at all times with the aperture in the contact making member to enable the operating member to be inserted into or withdrawn from said aperture, said apertures being formed to permit the operating member to cause relative movement between the contact making member and the locking member, a projection on said locking member extending into the aperture in said member, the operating member being inserted into the aperture to one side of said projection when opening the switch and engaging with said, projection to cause movement of said locking member into locking position when closing the switch. g

2. An electric switch as claimed in claim l comprising a member adapted to receive said switch blade, said member being engaged by the locking member to hold the said blade in closed position and a locking member.

member adapted to engage with projections on the member receiving the blade and acting to securely hold the blade in closed position.

THOMAS STRINGER. 

